Dust aspirator with a rotatable flexible tube connection



Jan. 11, 1949.

J. A. C. MALCHUS DUST ASPIRATOR WITH A ROTATABLE FLEXIBLE TUBE CONNECTION Filed Aug. 21,. 1946 Patented Jan. 11, 1949 2,458,614 OF'FlCE DUST ASPIRATOR WITH A ROTATABLE FLEXIBLE TUBE CONNECTION Johannes Andries Christiaan Malchus,

- Amsterdam, Netherlands Application August 21, 1946, Serial No. 692,079 In the Netherlands July 7, 1942 Section 1', Public Law 690, August 8, 1946 Patent expires July 7, 1962 6 Claims.

The invention relates to a dust aspirator with a rotatable flexible tube connection consisting of two in length direction to each other slidable sleeves mounted the one in the other, wherein the flexible tube is fixed in the inner sleeve. Said sleeve being provided at its inner end with a conical shaped part and the outer sleeve can be clamped in a mouthpiece of the dust aspirator casing as the outer sleeve being provided with sawcuts of the like forming tongues, and these tongues are pressed outward by the conical shape end of the inner sleeve, when the inner sleeve is moved under the tongues, which clamping is released by pressing the inner sleeve away from the elastic tongues, and a screw spring is pro-' vided maintaining both sleeves with respect to each other in the one outer position, as described in the Dutch Patent No. 52,021.

The mouthpiece in this construction is provided with a rotatable part, so that this element is very complicated and expensive and moreover both sleeves are maintained in the clamping position by the screw spring, with the disadvantage that for unlocking the sleeves the back pressure of the spring must be overcome, and the sleeves must be maintained in this unlocked position in order to be able to push the connection in the mouthpiece or to remove said connection from this mouthpiece. For this manipulation both hands are wanted.

This disadvantage is avoided by the invention and a simple and effective construction is obtained, because the screw spring presses the inner sleeve inwardly with respect to the outer sleeve in such a manner that the clamping action of the outer sleeve is normally released and the clamping action against the action of the spring is accomplished by pulling the flexible tube.

The invention will now be described by way of example with reference to the accompanying drawing, showing a longitudinal section through the axis of the connection.

An inner sleeve I2, in which the flexible tube (not shown) is fixed, is in the length direction slidable and easily rotatable mounted in an outer sleeve 9, I3, of which the part 9 has a larger diameter than the part I 3. In this part 9 a strong screw spring 8 is mounted, one end of which bears in a hollow edge I5 of the outer sleeve 9 and with the other end upon a ring l0, bearing against a bentedge II of the inner sleeve I2, transferring the tension of the spring to the inner sleeve I2. The other end of the sleeve I2 is formed to a funnel i l, in the one side preventing the sleeve I2 to leave the sleeve 9, l3 and on the other side to perform a function to be indicated further on. The largest diameter of this funnel i4 is smaller than the inner diameter of the mouthpiece 6 fixed in the lid 1 of the dust aspirator, but bigger than the inner diameter of the part I3 of the sleeve '9, I3.

. 2 I The inner end of the part l3 of the outer sleeve 9, I3 is provided with sawcuts forming elastic tongues, so that when the sleeve is pulled outwardly the sleeve I2 with respect to the sleeve 9, I3the tongues of this part I3 are pressed out. wardly against the sleeve 6, so that the sleeve9, I3 is clamped firmly in the sleeve 6. The spring 8 is then impressed and put under tension. If the sleeve i2 is released, then the spring 8 moves the sleeve 12 inwardly and the sleeve is rotatable again in the sleeve 9, I3. If it is wanted to draw the flexible tube out of the mouthpiece, only the outer sleeve 9 must be held with one hand and the connection is adapted to be removed easily out of the mouthpiece, becausethe funnel M'is free from the tongues and the same can now springback inwardly. Because the spring 8 is released normally, when the flexible tube is not' pulled, the'tube connection can easily be pushed into the mouthpiece. I

What I claim is:. i l. Attaching device comprising in combination an inner sleeve member; stop means provided on said inner sleeve member intermediate the endsthereof so as to form two inner sleeve portions divided from each other by said stop means; out wardly bent holding means at the free end of one of said inner sleeve portions of said inner sleeve member; an outer sleeve member composed of two outer sleeve portions one of which closely surrounds that inner sleeve portion the end of which is bent outwardly, and the other of which surrounds the other inner sleeve portion spaced from the same; and spring means within said space formed between said other inner sleeve portion and other outersleeve portion abutting at one end against said'stop means provided on said inner sleeve member and at the other end against said other outer sleeve portion tending to move said outer and inner sleeve relative to each other.

' 2. Attaching device comprising in combination an inner sleeve member; stop means provided on said inner sleeve member intermediate the ends thereof so as to form two inner sleeve portions divided from each other by said stop means; outwardly bent holding means at the free end of one of said inner sleeve portions of said inner sleeve member; an outer sleeve member composed of two outer sleeve portions one of which closely surrounds the other sleeve portion spaced from the same; outwardly bendable resilient means arranged at the free end of that outer sleeve portion which closely surrounds said inner" sleeve member and adapted to be bent outward by said outwardly bent holding means when saidinner sleeve member is pulled into said outer sleeve member; and spring means within said space formed between said other innersleeve portion and said other outersleeve portion tending to slide said sleeve members relative to each other.

3. Attaching device for holdingra tubulali: ar-. rangement within an opening comprising in combination an outer sleeve member closely fit-. ting into said opening; stop meansat the outer end of said outer sleeve member preyenting sliding of the same through said opening in inward direction; outwardly bendable stop means at the inner end of said outer sleeve memberpreventing when in outwardly-bentposition slide. ing of said outer sleeve member through said: opening in outward directiom; inner sleeve member closely fitting into said outer; sleeve. member and arranged within the same projectin at both e b yo d said outer sleeve member; outwardly bent stop means on the inner projecting; end: portion of said inner sleeve member preventing slidingofthesame through said outersleeve member in outward direction and adapted to outwardly bend said outwardly bendable stop means-at the inner endzof said-outersleeve memberwhen saidinner sleeve-member is pulled in outward: direction; stop means arranged on the outerprojecting: end: portion of said inner-sleeve memberpreventing slidingof the same through said. outer sleeve member in inward direction; and spring means mounted betweensaid outersleeve memben and said inner sleevemember tending-to slide said innersleeve memberwithinsaid outersleeve member in inward direction.

4; Attaching device. for holding a tubular arrangement within an opening comprising in com-. bination. an outer sleeve member closely fitting into said openings stop means at the. outer end: of; said; outer sleeve memberpreventing slidingof the same through said opening: in-inward direction; outwardly bendable stopmeans at; the inner! end: of said; outer sleeve; member preventing' when. in outward-lybent position slidingof said-2' outer sleeve. member through said. openingsin; outward-= direction; an inner sleeve member closely .fitting into said outer-sleeve member and arranged-within thetsame projecting atsboth-iends beyond said outer-sleeve member-so asItofor-man, inner projecting end: portion and outerprojecting end; -portion-;- outwardly bent stop; means; on. said innerprojectinge end-7 portion of said innerfsleeve member ad-apteditopass through said opening -but;preventing sliding ofisaid innersleeve. member through said outer-. sleeve.- memberin outward: direction and; adapted to outwardlybend said outwardly bendablerstop means at the inner endiof; said outerisleevemember when said innes sleeve; memberi is pulledin outward direc-. tion; stop means arranged -;on said=outer-project+ ing; end portion; of said inner sleeve member preventing sliding of the i same through said: outer sleeve-member ininward: direction; a tubular extension on;th er outer end of-saidvouter sleeve member; shaped soas toiforma. spacebetween itself and-1 said; inner projecting endportion of said; inner sleeve member; andspring; means arranged within said; spaceabutting at. one; end, against said stop means on; said outer projecting nd: o tion r; a dn e lee em b d em ts. ther: nd; a a nst a d b la ex ension; on; said outersleeve member tending, toslide; said-inner,sleevez member within said 'outer sleeve. m mbe ni nwerd rc i nl.

55 Attaching-device for holding; a tubular arrangement within an opening comprising in combination: an; outer sleeve; member closely fitinez nt d: en n n outw l bent: e ien; t: he out r nd ofr a dio t r e e menber preventing sliding; of the same through said enin s; n nw rd; i e tion; utwardly: beads able resilient tongues at the innerend of said outer sleeve member preventing in outwardly bent position sliding of said sleeve member thi iql h taid Opening in outward direction; an inner sleevemember closely fitting into said outer sleeve member and arranged within the same projectingatboth ends beyond said outer sleeve member so as to form an inner and an outer projecting; end; portion of said inner sleeve member. adapted; to pass through said opening, but preventing sliding of said inner sleeve member through said outer sleeve member in outward direction and adapted to outwardly bend said outwardly bendable resilient tongues at said inner end of said outer sleeve member when said innersleevelmembei is pulled in outward direction; an outwardly bent portion arranged on thevouter'projecting end portion of said inner:

sleeve memberpreventing sliding of the same through said outer sleeve member in inward direction; and spring means combined with said sleeve members. and tending to slide said. inner. sleeve: member within. said outer sleeve member ininward direction;

Attaching device-for holding a tubular arrangement within an opening comprising in combination an outer sleeve member closely fitting into said opening; an outwardly bent portionlat-kthe outer endof-said outer sleeve member: preventing: sliding ofrthe samethrough said 'openingsin inward direction; outwardly bendable: resilient tongues at the inner end of said outer sleeve memben preventing in outwardly bent; position sliding on said sleeve member through said opening. in outward direction; an

inner; sleeve member closely: fitting into said outer; sleeve. member; and arranged, within the same; projecting at: both endsbeyond said outer sleevememberso asto-form an inner and an outer; projecting end portion of saidinner sleeve member; adapted: to; pass through said opening, butzznreventing'flsliding of said inner sleeve memberthroughsaid outer sleeve member in outwarddirection; and; adapted to outwardly bend, said outwardly bendable resilient tonguesat said inner endof said outer sleeve-member when said inner sleevemernber-is pulled inoutward direction; an 7 a ainst saidoutwardly-bent portion arranged onthe, outer; projecting end" portion of'said inner sleevefmembeig and at its other end against said inwardly bent;;.portion arranged'attheouter end,

i; a d; ub lar; xt nsio sa d; sp l sp ndinstav lides aidg ner leeve m mbenwithin jlidx llifilf leeveememb r n inw rd direction-i JOITIANNESANDRIES CHRISTIAAN MALCHUS.

REFERENCES CITED FOREIGN PATENTS Number; Country Date netherlands vu'u Feb. 16, 1942: 

